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The viewport meta tag had user-scalable=no which blocked pinch-to-zoom on iOS and Android. SVG diagrams are 800px wide and scale down to ~47% on a 375px screen, making text inside unreadable without zoom. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
user-scalable=nofrom the viewport meta tag in_includes/head.htmlWhy
The SVG diagrams are 800px wide. On a 375px phone screen they render at ~47% scale, making the text inside them small. With
user-scalable=noset, iOS and Android both block pinch-to-zoom entirely, leaving no way to enlarge them.Removing
user-scalable=norestores the browser's native pinch-to-zoom. The rest of the viewport tag (initial-scale=1,shrink-to-fit=no,viewport-fit=cover) is unchanged.Testing Done